/*
 * Copyright 2023 NAVER Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.navercorp.pinpoint.realtime.collector.mapper;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;

/**
 * @author youngjin.kim2
 */
class MapperUtils {

    static <T, R> List<R> mapList(List<T> src, Function<T, R> mapper) {
        if (src == null) {
            return List.of();
        }
        final List<R> res = new ArrayList<>(src.size());
        for (final T item: src) {
            res.add(mapper.apply(item));
        }
        return res;
    }

    public static <T> List<T> nonNullList(List<T> src) {
        return Objects.requireNonNullElse(src, List.of());
    }

}
